E44.00 fault in inovance IS580 drive indicates "Speed error exceeds limit". This means the speed error has exceeded its allowable limit — meaning the actual motor speed deviates too much from the target (commanded) speed.

• Confirm encoder/resolver is securely connected and functioning.
• Ensure the load is not jammed, oversized, or changing suddenly.
• Double-check motor settings (rated frequency, voltage, poles, etc.).
• Reduce acceleration/deceleration times if they are too aggressive.